package test;

import java.security.MessageDigest;

public class MD5 {

	private final static String[] hexDigits={"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};
	
	/*
	 * 转换字节数组为16进制字符串
	 * @param b 字节数组
	 * @return 16进制字符串
	 */
	public static String byteArrayToHexString(byte[] b){
		StringBuffer resultSb=new StringBuffer();
		for(int i=0;i<b.length;i++){
			resultSb.append(byteToHexString(b[i]));
			
		}
		return resultSb.toString();
	}
	
	private static String byteToHexString(byte b){
		int n=b;
		if(n<0)
			n=256+n;
		int d1=n/16;
		int d2=n%16;
		return hexDigits[d1]+hexDigits[d2];
	}
	
	public static String compile(String origin){
		String resultString=null;
		try{
			resultString =new String(origin);
			MessageDigest md=MessageDigest.getInstance("MD5");
			resultString=byteArrayToHexString(md.digest(resultString.getBytes()));
		}
		catch(Exception ex){
			
		}
		return resultString;
	}
}
